Effect of autumn continuously rainy weather which cause waterlogging in rapeseed(Brassica napus L.)traits and yield
To better understand raining-weather effect on rapeseed(Brassica napus L.)yield during seeding stage,10 elite rapeseed varieties were planted in 11 ecological sites in the middle region of the Yangtze River.Agro-nomic traits,yield,quality and resistance between normal year(2019/2020)and autumn-rainy-waterlogging year(2020/2021)were observed to compare waterlogging rainy weather effects at seeding stage.Regression analysis be-tween monthly rainfall,temperature and yield and agronomic traits changes,showed waterlogging rainy weather lead to rapeseed seed and oil yield reduced by 21.8%,23.2%,and average seeding date delayed for 11.5 d,growth dura-tion shortened for 11.2 d,despite with well drainage treatment in the field.Among them,the plant height,silique number per plant and harvest density significantly decreased by 9.2%,21.1%and 6%,respectively.While the changes of oil content,elucic acid,glucosinolate,seed weight,seed per silique and Sclerotinia disease severity in-dex were not different in significant level.The regression analysis showed that the monthly rainfall increase in Octo-ber resulted in waterlogging,which cause of the yield loss directly,while secondary effects,such as delayed seeding date,low autumn temperature and reduced winter rainfall,contributed 25.4%,50.5%and 33%to the yield loss,re-spectively.Varieties in this study showed different tolerance to autumn waterlogging rainy weather with higher seed yield and oil content in normal year and higher waterlogging tolerance index,H1951,Yueyou 1577,9zyYP12 in-creased oil yield by 11%-16.5%to control variety,and waterlogging year increased by 5.4%-18.4%.
万方数据
维普
